<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8"/>
	<title>css实现三角形</title>	
	<style type="text/css">
	#myTriangle{
		width: 0px;
		height: 0px;
		border-top: 50px solid transparent;
		border-left: 50px solid transparent;
		border-bottom: 50px solid red;
		border-right: 50px solid transparent;
		left: 200px;
	}
	</style>
	<script src="js/timer.js"></script>
</head>
<body>
<div id="myTriangle"></div>
</body>
</html>